Abstract
In the present study, one-dimensional hydrodynamic simulation of the Pili River (Study Area) for the steady flow was carried out using ArcGIS and HEC-RAS considering floods of 5, 10, 25, 50 and 100 years return period under existing and modified river geometry. The results were transferred to Google Earth for the delineation of flood lines. Furthermore, one and two-dimensional unsteady-state simulations were carried out for floods of 25, 50 and 100 years return period using RAS Mapper, which provided a 2D visualization of the unsteady flow on Digital Elevation Model (DEM) and Google Earth. Validation of the model output results was carried out for the average dry weather flow, the depths of which were obtained from 14 different locations along the entire stretch of the study area. The validation results indicated the model having a correlation factor of 0.6447 with the actual on-site data obtained. Hence, the model was used to provide reliable information regarding the amount of submergence during an event of a flood. The flood lines obtained through the model will further help in providing a potential warning for floods and will also act as a guiding measure for the implementation of river training works such as dredging, slope stabilization and construction of levees for future riverbed planning and development activities along the river stretch.
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The authors are acknowledged to the Director VNIT Nagpur and Director CSIR-NEERI for their continuous support and infrastructural facility to carry out this research study. The authors are also thankful to the anonymous reviewers for their valuable suggestions in improving the quality of the manuscript substantially.
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Dash, S., Vijay, R., Gupta, R. (2022). Steady and Unsteady Hydrodynamic Simulation of Pili River as a Potential Flood Warning System Using HEC-RAS. In: Laishram, B., Tawalare, A. (eds) Recent Advancements in Civil Engineering. ACE 2020. Lecture Notes in Civil Engineering, vol 172. Springer, Singapore. https://doi.org/10.1007/978-981-16-4396-5_79
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